After installing aptosid on the HDD and login in as "nh2", I opened Dolphin.
The folder it opens by default is /home/nh2 but I noticed that the selected item in the "Places" panel on the left wasn't "Home" but "Root".
When I click on the "Home" item it tries to open the /home/aptosid folder, which doesn't exist, rather than my personal folder.

It's easy to fix: right-click on the Home item > Edit Entry 'Home'... but I'm reporting the bug for further releases.